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Browsing by Author "Vidal, Julien"
Now showing items 1-4 of 4
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Continuous unitary transformations in two-level boson systems
Dusuel, Sébastien; Vidal, Julien; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique
(American Physical Society, 2005-12-30)
Two-level boson systems displaying a quantum phase transition from a spherical (symmetric) to a deformed (broken) phase are studied. A formalism to diagonalize Hamiltonians with O(2L + 1) symmetry for large number of ... -
Finite-size scaling exponents in the interacting boson model
(American Physical Society, 2005-07-14)We investigate the finite-size scaling exponents for the critical point at the shape phase transition from U(5) (spherical) to O(6) (deformed -unstable) dynamical symmetries of the Interacting Boson Model, making use ... -
A scalar two-level boson model to study the IBM phase diagram in the Casten triangle
Vidal, Julien; Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique (American Physical Society, 2006-05-05)
We introduce a simple two-level boson model with the same energy surface as the Q-consistent Interacting Boson Model Hamiltonian. The model can be diagonalized for large number of bosons and the results used to check ... -
Two-level interacting boson models beyond the mean field
Arias Carrasco, José Miguel; Dukelsky, J.; García Ramos, José Enrique; Vidal, Julien (American Physical Society, 2007-01-02)
The phase diagram of two-level boson Hamiltonians, including the Interacting Boson Model (IBM), is studied beyond the standard mean field approximation using the Holstein-Primakoff mapping. The limitations of the usual ...
